JP4166877B2 - Packing and pipe fitting incorporating this - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packing and a pipe joint incorporating the same, and more particularly to a pipe joint that is widely used in the food industry, the medical and pharmaceutical industry, the semiconductor industry, etc., and that can be easily disassembled and cleaned.
[0002]
[Prior art]
This type of fitting requires a sanitary structure with excellent function, durability, and cleanability, so it is easy to disassemble, clean, and assemble, and fluid remains in the flow path. It is necessary that the structure does not.
[0003]
Typical pipe joints in this field include screw union type joints and clamp type or flange type ferrule joints, and end face seals are attached to the pipes and plugs of these pipe joints. In general, a structure or a structure with an O-ring is mounted.
[0004]
[Problems to be solved by the invention]
However, the above-described end face seal structure requires a large connection load of the pipe joint and does not take a large allowance to secure sufficient sealing performance.
[0005]
In addition, the O-ring mounting structure provides sufficient sealing against radial sealing and leakage due to bending, but the O-ring groove is not sufficiently cleaned, so the O-ring is used in sanitary fields such as the food industry. Adopting the format should be avoided as much as possible.
[0006]
In addition, the ferrule joints mentioned above are typical of equipment-related pipe joints in the sanitary field, but it takes time and labor to clean the pipes and replace the packing. There is a need for easy quick fitting.
[0007]
Therefore, the present inventor has been developed in view of the above-mentioned problems and demands, and the purpose thereof is to have a sufficient sealing property even when the connection load is low, and due to germs in the flow path. An object of the present invention is to provide a packing which prevents contamination and a pipe joint incorporating the packing.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there are formed two lip portions provided with a constant gap portion on the outer peripheral surface of the ring-shaped packing body, and from one end of both lip portions toward the inner diameter direction. This is a packing in which an outwardly expanding taper surface is formed.
[0009]
According to a second aspect of the present invention, there is provided a pipe joint in which a plug and a socket are attached and detached by sliding a sleeve and engaging a locking ball in outer peripheral grooves formed in the pair of plugs. A space is formed on the connection-facing surface, a ring-shaped packing body is mounted in this space, and a plurality of lip portions are formed on the outer peripheral surface of the packing body with a certain gap, and an inner diameter is formed from one end of each lip portion. Forming a tapered surface that extends outward in the direction, contacting the tapered portion of the connection-facing surface of the plug with the tapered surface of the packing body, and the lip portion on the inner peripheral surface of the space in the outer diameter direction It is a pipe joint brought into contact.
In this case, a large-diameter portion is formed at the distal end portion of one plug, and a small-diameter portion is formed at the other distal end portion, and when the large-diameter portion is engaged with the small-diameter portion, a space in which the packing body can be mounted is formed. Is preferred.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a packing and a pipe joint incorporating the packing according to the present invention will be specifically described below with reference to the drawings.
In FIGS. 1 and 2, reference numeral 1 denotes a ring-shaped packing body. On each side of the packing body 1, outwardly extending tapered surfaces 2 and 3 are formed along the inner diameter to form a trapezoidal section 4 in cross section. Further, two lip portions 5, 5 are formed in an annular shape on the outer peripheral surface of the trapezoidal section 4, and a gap 6 is provided between the lip portions 5, 5.
Since the packing body 1 applies fluids such as a wide variety of liquids from strongly acidic to strongly alkaline, the material is preferably EDPM, EPM, NBR, PTFE, Si or the like.
[0011]
3 and 4, the pipe joint incorporating the packing body 1 will be described. The outer peripheral surfaces of the pair of plugs 7, 8 are respectively formed with annular outer peripheral grooves 9, 10, and the inner peripheral surfaces are polished to mirror surfaces. It is finished to prevent contamination.
[0012]
A large diameter portion 14 is formed at the distal end portion of the plug 7, and a small diameter portion 15 is formed at the distal end portion of the plug 8.
Tapered portions 12 and 13 are formed on the inner peripheral step portion where the large diameter portion 14 of the plug 7 is formed and the inner peripheral end surface of the small diameter portion 15 of the plug 8, respectively. By engaging the pair of plugs 7 and 8 configured as described above, a space 11 is formed between the inner peripheral step portion where the large diameter portion 14 is formed and the distal end surface of the small diameter portion 15.
[0013]
In FIG. 3, reference numeral 16 denotes a socket. A plurality of protrusions and recesses 17 are formed in the socket 16 in the centripetal direction, and locking balls 18 are provided in the protrusions and recesses 17 so as to freely protrude and retract in the centrifugal direction. Stop rings 19, 19 are attached to the outer peripheral surfaces of both ends of the 16, and sleeves 21, 22, which are urged through a spring 20 on the outer periphery of the socket 16, are slidable between the stop rings 19.
The sleeves 21 and 22 are formed with pressers 23 and 24 for preventing the locking ball 18 from protruding in the centrifugal direction and escape portions 25 and 26 for releasing the locking by protruding the locking ball 18 in the centrifugal direction. .
In the figure, reference numeral 27 denotes a ferrule part for pipe connection provided at the end of the plugs 7 and 8.
[0014]
The operation in the following embodiment will be described.
The packing body 1 is mounted in the space 11 of the pair of plugs 7 and 8, and the locking balls 18 are pressed by the sleeves 21 and 22 of the socket 16 so as to straddle the pair of plugs 7 and 8. 8, since the taper surfaces 2 and 3 of the packing body 1 and the taper portions 12 and 13 of the plugs 7 and 8 are in sealing contact as shown in FIG. 3, the component force Z of the vector X in FIG. Since the seal surface pressure increases, there is no leakage of fluid due to bending of the joint, and the tightening allowance is suppressed, so the connection load between the socket 16 and the plugs 7 and 8 is reduced, and the socket and plug are attached / detached accordingly. Becomes easy.
[0015]
Furthermore, as shown in FIG. 4, when a force (arrow in the figure) due to back pressure is applied to the packing body 1, a component force Q of vector O in the figure is applied to the seal surface, and the sealing performance when fluid pressure is applied. Will improve.
As described above, the sealing force of the packing main body 1 is sealed with two forces of the axial tightening margin by the end face seal and the back pressure when the working pressure is applied to the packing main body 1. it can.
[0016]
Further, the lip portions 5, 5 formed on the outer peripheral surface of the packing body 1 absorb the component force Y of the vector X and the component force P of the vector O into the gap portion 6 of the two lip portions 5, 5, and the packing body 1 4 is filled with the packing body 1 of the volume that has been pressed and moved into the gap 6 without expanding as shown by the two-dot chain line in FIG. Since the inner diameter of 8 is always the same size and straight, contamination and the like can be minimized.
[0017]
Further, since the lip portions 5 and 5 are in contact with the inner peripheral surface of the space 11 of the plugs 7 and 8, the packing body 1 is prevented from tilting and falling, so that a long-term sealing performance is maintained. , Trying to maintain an excellent sanitary structure.
[0018]
Next, the state where the plugs 7 and 8 are separated and the inside is cleaned or the packing body 1 is replaced will be described. In this case, the plug 7 side is fixed to the pipe.
First, when the sleeves 21 and 22 are brought close to each other against the spring 20, the locking balls 18 and 18 are positioned at the escape portions 25 and 26 of the sleeves 21 and 22, so that the locking can be released. In this state, the socket 16 is slid to the plug 7 side to position the socket 16 on the plug 7 side, thereby exposing both ends of the plugs 7 and 8.
[0019]
Next, when the plug 8 is pulled out from the plug 7, the plugs 7 and 8 can be easily separated, so that the cleaning operation and the replacement of the packing body 1 can be performed reliably.
[0020]
【The invention's effect】
As is clear from the above, according to the present invention, when a tightening allowance equivalent to that of the conventional end face seal structure is given, the connection load of the pipe joint is significantly lighter than that of the conventional structure, and the sealing performance is also improved. And has sufficient sealing performance against bending leakage of pipe joints.
[0021]
In addition, the packing can keep the inner diameter dimension of the packing to the same dimension as the flow path diameter without bulging to the inner peripheral surface side, so that contamination by germs in the flow path can be surely prevented. In the sanitary field such as the food industry, it will demonstrate its utility value.
Furthermore, since it is easy to attach, detach, disassemble and assemble the pipe joint, there are excellent effects such as easy cleaning of the pipe and replacement of the packing as compared with the conventional joint.
[Brief description of the drawings]
FIG. 1 is a half-cross sectional front view of a packing according to the present invention.
FIG. 2 is an enlarged view of part a in FIG.
FIG. 3 is a half-cross sectional front view of a pipe joint according to the present invention.
4 is a partially enlarged cross-sectional view in FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Packing body 2, 3 Tapered surface 5 Lip part 6 Cavity part 7, 8 Plug 9, 10 Outer peripheral groove 11 Space 12, 13 Taper part 14 Large diameter part 15 Small diameter part 16 Socket 18 Locking ball 20 Spring 21, 22 Sleeve

Claims (3)

A packing having two lip portions provided with a constant gap on the outer peripheral surface of a ring-shaped packing body, and a taper surface extending outward from one end of both lip portions toward the inner diameter direction. . In the pipe joint that attaches and detaches the plug and the socket by sliding the sleeve and engaging the locking ball in the outer circumferential groove formed in each of the pair of plugs, a space is formed on the connection facing surface of the pair of plugs, A ring-shaped packing body is mounted in this space, and a plurality of lip portions are formed on the outer peripheral surface of the packing body with a certain gap, and a taper surface that extends outward from one end of each lip portion toward the inner diameter direction. The taper portion of the connection facing surface of the plug and the taper surface of the packing body are brought into contact with each other, and the lip portion is brought into contact with the inner peripheral surface in the outer diameter direction of the space. Pipe fittings. A large-diameter portion is formed at the distal end portion of one plug, and a small-diameter portion is formed at the other distal-end portion, and when the large-diameter portion is engaged with the small-diameter portion, a space is formed in which the packing body can be mounted. Item 3. The pipe joint according to Item 2.

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